Legitimately

Physical

Complete Adventure works fine. It’s the only release for the system so really not much to say here. No way to get Season Two because it never released on the Wii U, perhaps because of poor sales, and becoming obsolete at the Switch's release in 2017.


Digital

No keys exist (to my knowledge) therefore the only form of legitimate digital download is if you purchased the digital-exclusive Season Pass version or Complete Adventure before they were delisted in 2019.